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(2013·潍坊高考模拟)Air pollution is getting more and more serious,so we must take action________it is too late.

A.before B.after

C.until  D.when

 

A

【解析】考查状语从句。句意为:空气污染越来越严重,所以我们必须趁现在还来得及的时候采取行动。根据句意可知,应用before,表示“在……以前”。

答案: A

 

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